Display panel and display device

ABSTRACT

A display panel and a display device. The display panel includes a transition region and a light-transmitting region, and a light transmittance of the light-transmitting region is greater than a light transmittance of the transition region. The display panel includes a driving backplane including a first driving circuit disposed in the transition region, a planarization layer disposed on the driving backplane of the transition region and the light-transmitting region, a first electrode layer disposed at a side of the planarization layer of the transition region and the light-transmitting region, and a plurality of first light-emitting units disposed in the light-transmitting region. The first electrode layer is electrically connected with the first output terminal by extending through the planarization layer, and is configured to provide electrical signals for the plurality of first light-emitting units.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of international applicationNo. PCT/CN2021/070158 filed on Jan. 4, 2021, and claims priority toChinese patent application No. 202010119715.4, entitled “DISPLAY PANEL,DISPLAY DEVICE AND METHOD FOR MANUFACTURING DISPLAY PANEL” filed Feb.26, 2020, which is incorporated by reference herein in its entirety.

TECHNICAL FIELD

Embodiments of the present disclosure relates to the field of displaytechnology, in particular to a display panel and a display device.

BACKGROUND

A screen-to-body ratio of electronic equipment has always been a majorconcern for users and manufacturers. The screen-to-body ratio generallyrefers to a ratio of display screen area to front panel area of theelectronic equipment. In order to meet the demand of largescreen-to-body ratio, the concept of full display emerges. In order torealize a full display, a region of the display screen corresponding toa camera in the display panel is set with pixels for displaying images.

SUMMARY

Some embodiments of the present disclosure provide a display panel and adisplay device, thereby improving the display performance of the displaypanel.

In order to solve the above technical problems, some embodiments of thepresent disclosure provide a display panel including a transition regionand a light-transmitting adjacent to the transition region, a lighttransmittance of the light-transmitting region being greater than alight transmittance of the transition region, wherein the display panelincludes: a driving backplane including a first driving circuit disposedin the transition region, the first driving circuit being provided witha first output terminal; a planarization layer disposed on the drivingbackplane of the transition region and the light-transmitting region; afirst electrode layer disposed at a side, facing away from the drivingbackplane, of the planarization layer of the transition region and thelight-transmitting region, wherein first electrode layer is electricallyconnected with the first output terminal by extending through theplanarization layer; wherein the first electrode layer disposed in thelight-transmitting region includes at least two electrode blocks and anelectrode bridge connecting two adjacent electrode blocks; and aplurality of first light-emitting units disposed in thelight-transmitting region, wherein each of the plurality of firstlight-emitting units is correspondingly disposed at a side, facing awayfrom the driving backplane, of corresponding one of the at least twoelectrode blocks; the first electrode layer is configured to provideelectrical signals for the plurality of first light-emitting units.

The display panel includes the transition region and thelight-transmitting region adjacent to the transition region, and thelight transmittance of the light-transmitting region is greater than thelight transmittance of the transition region. The display panelcorresponding to the transition region is provided with the firstelectrode layer for providing the electrical signals to the plurality offirst light-emitting units in the light-transmitting region. Therefore,the display panel corresponding to the light-transmitting region may beconfigured for both image display and light transmission. The firstelectrode layer disposed in the light-transmitting region of the displaypanel includes the at least two electrode blocks and the electrodebridge connecting the two adjacent electrode blocks. Therefore, byoptimizing an arrangement of the first electrode layer in thelight-transmitting region, the first electrode layer is arranged acrossthe plurality of first light-emitting units and provides the electricalsignals for the plurality of first light-emitting units. In addition,there is one electrode layer (i.e., the first electrode layer) betweenthe first light-emitting units and the planarization layer. Comparedwith a technical solution that there are two electrode layers betweenthe first light-emitting unit and the planarization layer, the presentembodiments removes one electrode layer, which is beneficial tosimplifying the manufacturing process of the display panel and savingcost. Moreover, the present embodiments weakens bombardment of anelectrode layer material on the planarization layer when forming theelectrode layer, improves the interface performance of the planarizationlayer, and further can improve the quality and morphology of the firstelectrode layer, and can improve the performance of the display panel.

Some embodiments of the present disclosure further provide a displaydevice including the display panel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a top view of a display panel accordingto some embodiments of the present disclosure.

FIG. 2 is a schematic diagram of a partial cross-sectional view of thedisplay panel in FIG. 1 cut along an YY1 direction.

FIG. 3 is a schematic diagram of another top view of a first electrodelayer in a display panel according to some embodiments of the presentdisclosure.

FIG. 4 is a schematic diagram of a cross-sectional viewof a displaypanel according to some embodiments of the present disclosure.

FIG. 5 is a schematic structural diagram corresponding to a plurality ofsteps in a method for manufacturing a display panel according to someembodiments of the present disclosure.

FIG. 6 is a schematic structural diagram corresponding to a plurality ofsteps in a method for manufacturing a display panel according to someembodiments of the present disclosure.

FIG. 7 is a schematic structural diagram corresponding to a plurality ofsteps in a method for manufacturing a display panel according to someembodiments of the present disclosure.

FIG. 8 is a schematic structural diagram corresponding to a plurality ofsteps in a method for manufacturing a display panel according to someembodiments of the present disclosure.

FIG. 9 is a schematic structural diagram corresponding to a plurality ofsteps in a method for manufacturing a display panel according to someembodiments of the present disclosure.

DETAILED DESCRIPTION

It can be known from the background technology that the performance ofan existing display panel needs to be improved, for example, aphotographing effect of a camera is poor. In order to increase a lighttransmittance of a light-transmitting region and improve the lightcollection effect of a light collection component of a camera in thelight-transmitting region, a driving backplane of the light-transmittingregion is generally not provided with a driving circuit, andlight-emitting units in the light-transmitting region are provided withan electrical signal(s) from a driving circuit in a transition region.However, while improving the light transmittance of thelight-transmitting region, it also faces a problem of an abnormaloverlap between anodes of a main screen region and the transition regionand output terminals of their driving circuits respectively, and thereis also a problem of an Ag migration in the anodes of the main screenregion and the transition region, resulting in an abnormal display ofthe main screen region and the transition region.

It is found that a conventional manufacturing method for a display panelincludes: providing a transparent electrode layer in thelight-transmitting region of the display panel. Taking the material ofthe transparent electrode layer being an ITO material as an example, adrain of the main screen region and a drain of the transition region maybe exposed to an ITO-sputtering process environment and a patterningprocess environment, which may lead to changes in the physical andchemical properties of the drain surface material, thus causing changesin the physical and chemical properties of the material of drainsurfaces, resulting in abnormal overlap between the drain and itscorresponding anode.

In addition, the planarization layer of the transition region and themain screen region may also be exposed to the sputtering processenvironment for forming the transparent electrode layer. The ITOmaterial may bombard a surface of the planarization layer, resulting inthe deterioration of the surface performance of the planarization layer.When an anode containing the Ag is formed on the surface of theplanarization layer later, the Ag in the anode easily migrates from thedamaged surface of the planarization layer, resulting in a loose anduneven layer of Ag and an abnormal performance of the display panel.

In order to solve the above problems, some embodiments of the presentdisclosure provide a display panel. A first electrode layer disposed ina light-transmitting region of the display panel includes at least twoelectrode blocks and an electrode bridge connecting two adjacentelectrode blocks. Therefore, by optimizing an arrangement of the firstelectrode layer in the light-transmitting region, the first electrodelayer is arranged across a plurality of first light-emitting units andprovides electrical signals for the plurality of first light-emittingunits. In addition, there is only one electrode layer (i.e., the firstelectrode layer) between the first light-emitting units and theplanarization layer. Compared with a technical solution that there aretwo electrode layers between the first light-emitting units and theplanarization layer, the present disclosure removes one electrode layer,which is beneficial to simplifying the manufacturing process of thedisplay panel and saving cost. Moreover, the present disclosure weakensa bombardment of a material of an electrode layer on the planarizationlayer when forming the electrode layer, improves the interfaceperformance of the planarization layer, and further can improve thequality and morphology of the first electrode layer, and can improve theperformance of the display panel.

The embodiments of the present disclosure will be described in detailbelow with reference to the accompanying drawings in order to make theobjectives, technical solutions and advantages of the present disclosureclearer. However, it will be apparent to those skilled in the art that,in the various embodiments of the present disclosure, numerous technicaldetails are set forth in order to provide the reader with a betterunderstanding of the present disclosure. However, the technicalsolutions claimed in the present disclosure may be implemented withoutthese technical details and various changes and modifications based onthe following embodiments. The following embodiments are divided forconvenience of description, and should not constitute any limitation tothe specific implementation of the present disclosure. The variousembodiments may be combined with each other and referred to each otheron the premise of no contradiction.

FIG. 1 is a schematic diagram of a top view of a display panel accordingto some embodiments of the present disclosure, and FIG. 2 is a schematicdiagram of a partial cross-sectional view of the display panel in FIG. 1cut along an YY1 direction.

As shown in FIGS. 1 and 2, a display panel 200 is provided with atransition region 250 and a light-transmitting region 260 adjacent toeach other, and a light transmittance of the light-transmitting region260 is greater than a light transmittance of the transition region 250.The display panel 200 includes: a driving backplane 201, a planarizationlayer 207, a first electrode layer 203 and a plurality of firstlight-emitting units 204 disposed in the light-transmitting region 260.The driving backplane 201 includes a first driving circuit 216 disposedin the transition region 250, and the first driving circuit 216 isprovided with a first output terminal 256. The planarization layer 207is disposed on the driving backplane 201 of the transition region 250and the light-transmitting region 260. The first electrode layer 203 isdisposed at a side, facing away from the driving backplane 201, of theplanarization layer 207 of the transition region 250 and thelight-transmitting region 260, and the first electrode layer 203 isconfigured to extend through the planarization layer 207 to beelectrically connected with the first output terminal 256. The firstelectrode layer 203 disposed in the light-transmitting region 260includes at least two electrode blocks 241 and an electrode bridge 242connecting two adjacent electrode blocks 241. Each of the plurality offirst light-emitting units 204 is correspondingly disposed at a side,which is facing away from the driving backplane 201, of each electrodeblock 241, and the first electrode layer 203 is used for providingelectrical signals for the plurality of first light-emitting units 204.

The display panel according to these embodiments will be described indetail with reference to the accompanying drawings.

The display panel 200 includes a main screen region 240, the transitionregion 250 and the light-transmitting region 260. The transition region250 is disposed between the main screen region 240 and thelight-transmitting region 260.

The main screen region 240, the transition region 250 and thelight-transmitting region 260 all have an image display function. Thelight transmittance of the light-transmitting region 260 is greater thanthe light transmittance of the main screen region 240 and the lighttransmittance of the transition region 250. The light transmittance ofthe main screen region 240 and the light transmittance of the transitionregion 250 may be the same. The light-transmitting region 260 may beused for both displaying image and transmitting light. Therefore, itfacilitates to set a light collection component of a camera in thelight-transmitting region 260, so that the light collection component ofthe camera can receive enough light while ensuring a high screen-to-bodyratio, thereby improving the photographing effect.

The driving backplane 201 includes a substrate 210 and a drivingcomponent layer 243 on the substrate 210.

In this embodiment, the display panel 200 may be applied to a flexibledisplay device, and the substrate 210 is a flexible substrateaccordingly. A material of the flexible substrate is a polyethylene(PE), a polypropylene (PP), a polystyrene (PS), a polyethyleneterephthalate (PET), a polyethylene naphthalate (PEN) or a polyimide(PI). The substrate 210 may be an ultra-thin glass substrate, and athickness of the ultra-thin glass substrate is less than 50 μm. It canbe understood that in other embodiments, the substrate may be a rigidsubstrate, such as a rigid glass.

The driving component layer 243 provides driving signals for thelight-emitting units in the display panel 200 to emit light. The drivingcomponent layer 243 includes a plurality of layers and includes: anactive layer 237 and a gate structure disposed on the active layer 237,the gate structure including a gate dielectric layer 213 and a gateelectrode layer 247 disposed on the gate dielectric layer 213; a sourcein the active layer 237 disposed at one side of the gate structure, adrain in the active layer 237 disposed at the other side of the gatestructure; a first capacitor conductive layer 219 disposed on the gatedielectric layer 213; a capacitor dielectric layer 214 covering the gatestructure, the first capacitor conductive layer 219 and the active layer237; a second capacitor conductive layer 218 disposed on the capacitordielectric layer 214 and directly opposite to the first capacitorconductive layer 219 to form a storage capacitor; an insulatingdielectric layer 215 covering the capacitor dielectric layer 214 and thesecond capacitor conductive layer 218; a source electrode and a drainelectrode extending through the insulating dielectric layer 215, thecapacitor dielectric layer 214, and the gate dielectric layer 213,wherein the source electrode is electrically connected to the source,the drain electrode is electrically connected to the drain.

In this embodiment, the driving component layer 243 has a thin filmtransistor (TFT) and the storage capacitor. The thin film transistor maybe a low temperature poly-silicon (LTPS) thin film transistor. It can beunderstood that the driving device layer 243 may also include other filmlayer structures, and the above merely lists the structure of the thinfilm transistor as an example.

The driving component layer 243 is used to form a driving circuit. Thedriving circuit may include at least one thin film transistor and atleast one storage capacitor. The thin film transistor may be a switchtransistor and/or a drive transistor. In this embodiment, there is nodriving circuit in the driving component layer 243 of thelight-transmitting region 260, so as to meet the requirement of highlight transmittance of the light-transmitting region 260. That is, thedriving component layer 243 of the light-transmitting region 21 does nothave the thin film transistor and the storage capacitor. The drivingdevice layer 243 of the transition region 250 is provided with a firstdriving circuit 216, and the first driving circuit 216 is provided witha first output terminal 256. In this embodiment, the first outputterminal 256 is a drain electrode of the thin film transistor of thefirst driving circuit 216.

In this embodiment, the driving backplane 210 further includes a seconddriving circuit (not shown) disposed in the transition region 250. Thesecond driving circuit is provided with a second output terminal, andthe second driving circuit is used for providing electrical signals forthe light emitting units of the transition region 250. The drivingbackplane 201 may further include a third driving circuit 217 disposedin the main screen region 240, and the third driving circuit 217 isprovided with a third output terminal 257. The third output terminal 257may be a drain electrode of the thin film transistor of the thirddriving circuit 217 for providing electrical signals for thelight-emitting units of the main screen region 240.

In this embodiment, the display panel 200 further includes an electricalconnection portion 230 disposed at a side, which is facing to thedriving backplane 201, of the planarization layer 207 of the transitionregion 250. A material of the electrical connection portion 230 is aconductive material, such as a metal material. In addition, the materialof the electrical connection portion 230 may be the same as a materialof the first output terminal 256.

In this embodiment, the display panel 200 further includes an electricalconnection layer 202. The electrical connection layer 202 is disposed atthe side, which is facing to the driving backplane, of the planarizationlayer 207 of the transition region 250, and the electrical connectionlayer 202 is used for electrically connecting the electrical connectionportion 230 with the first output terminal 256. The first electrodelayer 203 is electrically connected to the first output terminal 256through the electrical connection portion 230 and the electricalconnection layer 202. The first driving circuit 216 of the transitionregion 250 is used to provide the electrical signals for the firstlight-emitting units 204 of the light-transmitting region 260. That is,the light-transmitting region 260 is not provided with a drivingcircuit, so that the light transmittance of the light-transmittingregion may be improved on the premise of ensuring that thelight-transmitting region 260 has a display function.

A light transmittance of the electrical connection layer 202 is greaterthan a light transmittance of the first electrode layer 203. A materialof the electrical connection layer 202 is a transparent electrodematerial, such as ITO or IZO. A thickness of the electrical connectionlayer 202 is 280-340 angstroms, such as 300 angstroms and 320 angstroms.In other embodiments, the material of the electrical connection layermay also be at least one of Mg/Ag alloy, Al, Li, Ca and In.

In this embodiment, the display panel 200 further includes theplanarization layer 207 disposed on the driving backplane 201 of themain screen region 240, the transition region 250 and thelight-transmitting region 260.

The planarization layer 207 covers the driving backplane 201 of the mainscreen region 240 in addition to the driving backplane 201 of thelight-transmitting region 260 and the driving backplane 201 of thetransition region 250. On one hand, the planarization layer 207 mayprovide a surface with a high flatness. On the other hand, theplanarization layer 207 may further provide an interface for the firstelectrode layer 203.

A material of the planarization layer 207 is a transparent material. Thetransparent material may be an inorganic transparent material such as asilicon oxide. Alternately, the transparent material may be an organictransparent material such as the polyimide. In this embodiment, thematerial of the planarization layer 207 is the polyimide.

The planarization layer 207 disposed in the transition region 250 isprovided with a first through hole 225 extending through theplanarization layer 207, and the first through hole 225 exposes a partof the surface of the electrical connection portion 230.

In this embodiment, the display panel 200 further includes the firstelectrode layer 203 and the plurality of first light-emitting units 204in contact with the first electrode layer 203.

Herein, the first electrode layer 203 is disposed at the side, which isfacing away from the driving backplane 201, of the planarization layer207 of the transition region 250 and the light-transmitting region 260.The first electrode layer 203 contacts with the electrical connectionportion 230 by extending through the planarization layer 207. In oneexample, at least a part of the first electrode layer 203 is disposed inthe first through hole 225, and is in contact with the electricalconnection portion 230 exposed by the first through hole 225. Theelectrical connection portion 230 is electrically connected with thefirst output terminal 256 through the electrical connection layer 202,thereby realizing an electrical connection between the first electrodelayer 203 and the first output terminal 256. In addition, since thefirst electrode layer 203 electrically contacts with the plurality offirst light-emitting units 204, the first output terminal 256 mayachieve to control the plurality of first light-emitting units 204 towork, thereby realizing the image display function of thelight-transmitting region 260.

The driving backplane 201 of the light-transmitting region 260 is notprovided with a driving circuit, and the first light-emitting units 204of the light-transmitting region 260 is electrically connected with thefirst driving circuit 216 of the transition region 250 to realize theimage display function. Therefore, blocking or reflecting the lightincident into the light-transmitting region 260 due to the drivingcircuit may be prevented, so that the light transmittance of the displaypanel 200 in the light-transmitting region 260 is improved, and morelight may be received by the light collection component of the cameradisposed in the light-transmitting region 260. That is, light collectionamount of the light collection component of the camera may be improved,thereby improving the photographing effect and quality of the camera.

In addition, in an existing technical solution, the light-transmittingregion includes a plurality of driving circuits. The planarization layeris provided with a plurality of through holes extending through theplanarization layer and exposing each driving circuit, and each throughhole is provided with an electrode layer connected with eachlight-emitting unit. That is, discrete electrode layers are respectivelydisposed in the plurality of through holes, and each electrode layerprovides an electrical signal for each light-emitting unit correspondingto the electrode layer. That is, in this technical solution, theplanarization layer of the light-transmitting region is provided with aplurality of through holes, and a filling material in the through holesis different from a material of the planarization layer. Since thematerial in the through hole is different from a material of theplanarization layer, the refractive index of the material of the throughhole is also different from the refractive index of the material of theplanarization layer. When light passes through the light-transmittingregion, a transmission direction of the light passing through thethrough hole is different from a transmission direction of the lightpassing through other regions of the planarization layer. That is, thetransmission directions of the light reaching the light collectioncomponent of the camera are varied, which may cause an obviousdiffraction problem, thus affecting the photographing effect of thecamera. However, in this embodiment, there is no through hole in theplanarization layer 207 of the light-transmitting region 260, and thethickness of the planarization layer 207 of the light-transmittingregion 260 is uniform. That is, the material of the planarization layer207 of the light-transmitting region 260 is uniform and homogeneous.There is no obvious difference in the refractive indexes of lightsincident on the planarization layer 207, that is, the planarizationlayer 207 of the light-transmitting region 260 has a uniform refractioneffect for light in different regions, and then the transmissiondirection of the light passing through the planarization layer 207 tendsto be uniform, so that the transmission directions of the light receivedby the light collection component of the camera are approximately thesame, which may avoid the diffraction problem of the light in thelight-transmitting region 260, thereby improving the photographingeffect.

In this embodiment, the first electrode layer 203 includes a firsttransparent electrode layer (not shown), a metal electrode layer (notshown) and a second transparent electrode layer (not shown) which aresequentially stacked. Therefore, the first electrode layer 203 may beused as a fully reflective layer forming an optical microcavity in thedisplay panel, and form the optical microcavity with the firstlight-emitting unit 204, so that a chromaticity coordinate of thelight-transmitting region 260 tends to a standard chromaticitycoordinate.

A material of the first transparent electrode layer and a material ofthe second transparent electrode layer include an indium tin oxide (ITO)or a zinc tin oxide (IZO). A material of the metal electrode layerincludes at least one of Mg, Ag and Al. In one example, the firstelectrode layer 203 may have a laminated structure of ITO layer/Aglayer/ITO layer. In one example, the first electrode layer may also be asingle-layer structure or a laminated structure. In this embodiment, thefirst electrode layer 203 is an anode.

In this embodiment, the display panel 200 further includes the firstelectrode layer 203 and the first light-emitting units 204 disposed inthe light-transmitting region 260.

As shown in FIG. 1, the first electrode layer 203 disposed in thelight-transmitting region 260 includes at least two electrode blocks 241and an electrode bridge 242 connecting two adjacent electrode blocks241. With regard to the structures of the electrode block 241 and theelectrode bridge 242, reference may be made according to the foregoingdescription of the first electrode layer 203.

In this way, the two adjacent electrode blocks 241 are electricallyconnected through the electrode bridge 242, so that at least two firstlight-emitting units 204 in the light-transmitting region 260 may sharethe same driving circuit. Since the space occupied by the electrodebridge 242 is small, the transmittance requirement of thelight-transmitting region 260 may be met. Further, since the firstelectrode layer 203 is a laminated structure containing Ag, the firstelectrode layer 203 provides a semi-transparent and semi-reflective filmto form the optical microcavity for the light-transmitting region 260.That is to say, in this embodiment, the display panel 200 correspondingto the light-transmitting region 260 has the optical microcavity, sothat a cavity length difference among the light-transmitting region 260,the main screen region 240 and the transition region 250 is small,thereby improving a chromaticity coordinate consistency of thelight-transmitting region 260, the main screen region 240 and thetransition region 250, and further improving the display effect of thedisplay panel.

Each first light-emitting unit 204 is correspondingly disposed on theside, which is facing away from the driving backplane 201, of eachelectrode block 241. An orthographic projection of the electrode bridge242 on the driving backplane 201 is at least disposed in a regionbetween two orthographic projections of two adjacent firstlight-emitting units 204 on the driving backplane 201. That is, theelectrode bridge 242 is at least disposed between two adjacent firstlight-emitting units 204. In one example, the orthographic projection ofthe first light-emitting unit 204 on the driving backplane 201 is largerthan the orthographic projection of the electrode block 241corresponding to the first light-emitting unit 204 on the drivingbackplane 201. That is, the size of the first light-emitting unit 204 islarger than the size of the electrode block 241 corresponding to thefirst light-emitting unit 204.

In addition, an area of the orthographic projection of the electrodebridge 242 on the driving backplane 201 is smaller than an area of theorthographic projection of the electrode block 241 on the drivingbackplane 201. That is, the size of the electrode bridge 242 is smallerthan the size of the electrode block 241. In a direction orthogonal to asurface of the driving backplane 201 and perpendicular to an extendingdirection of the electrode bridge 242, a cross-sectional width of theelectrode bridge 242 ranges from 1 μm to 4 μm, for example, 2 μm, 2.8 μmand 3 μm. Therefore, a luminous flux blocked by the electrode bridgewhen the light disposed at outside of the screen enters the displaypanel in the light-transmitting region may be reduced, and the lighttransmittance of the light-transmitting region may be improved.

Since the size of the electrode bridge 242 is smaller than the size ofthe electrode block 241, and the electrode bridge 242 is at leastdisposed between two adjacent first light-emitting units 204, it may beavoided that most of the light incident through a region between the twoadjacent first light-emitting units 204 is blocked and reflected by theelectrode bridge 242. That is, most of the light may be incident intothe display panel 200 through the region between the two adjacent firstlight-emitting units 204, and the light transmittance of the displaypanel 200 in the light-transmitting region 260 is high, which isbeneficial to improving the photographing effect of the camera disposedin the light-transmitting region 260. In addition, the size of the firstlight-emitting unit 204 is larger than the size of the electrode block241 corresponding to the first light-emitting unit 204, which mayprevent light from being blocked and reflected by the electrode block241, thereby further improving the light transmittance of the displaypanel 200 in the light-transmitting region 260 and improving thephotographing effect of the camera disposed in the light-transmittingregion 260.

In this embodiment, a cross-sectional width of the electrode bridge 242ranges from 2.5 μm to 3.5 μm in the direction orthogonal to a surface ofthe driving backplane 201 and perpendicular to an extending direction ofthe electrode bridge 242. In this way, while ensuring the high lighttransmittance of the light-transmitting region 260, it is beneficial toreduce the manufacturing process difficulty of the electrode bridge 242,such as reducing an etching difficulty of forming the electrode bridge242 by a wet etching, and further ensuring that the electrode bridge 242has a good morphology. In this way, it avoids an unnecessary electricalconnection between the adjacent electrode bridges 242, thereby furtherimproving the display effect of the display panel.

Each first electrode layer 203 includes at least two electrode blocks241 and the electrode bridge 242 connecting the two adjacent electrodeblocks 241.

In this embodiment, as shown in FIG. 1, there are three or moreelectrode blocks 241. The shape of the first electrode layer 203disposed in the light-transmitting region 260 is a zigzag shape, andeach electrode block 241 is at an inflection point of the zigzag shape.Therefore, the first light-emitting units 204 electrically connected tothe same driving circuit are distributed in the zigzag shape, which mayincrease a pixel density of the light-transmitting region 260.

In order to further increase the pixel density of the light-transmittingregion 260, the two adjacent electrode bridges 242 of the firstelectrode layers 203 are parallel. In this embodiment, a distancebetween the parallel electrode bridges 242 is greater than or equal to 5μm, which is conducive to increasing the pixel density of thelight-transmitting region 260, further increasing a light-transmittingarea of the light-transmitting region 260, and further improving thelight transmittance of the light-transmitting region 260.

In FIG. 2, for example, there are four first light-emitting units 204.That is, one first electrode layer 203 is electrically connected withfour first light-emitting units 204. In other embodiments, one firstelectrode layer may be electrically connected with two, three or anynumber of first light-emitting units.

It can be understood that in other embodiments, the shape of the firstelectrode layer may be a regular straight line or an irregularconnecting line. FIG. 3 is a schematic diagram of another top view ofthe display panel according to some embodiments of the presentdisclosure. As shown in FIG. 3, electrode blocks 241 and the electrodebridge 242 connecting two adjacent electrode blocks 241 are arrangedalong a regular straight line.

The first light-emitting unit 204 includes a hole inject layer (HIL), ahole transport layer (HTL) disposed on the hole inject layer, anemitting layer (EML) disposed on the hole transport layer, an electrontransport layer (ETL) disposed on the emitting layer, and an electroninject layer (EIL) disposed on the electron transport layer.

The first light-emitting unit 204 may emit a red light, a blue light ora green light.

In this embodiment, there is only one electrode layer (i.e., the firstelectrode layer 203) disposed between the first light-emitting unit 204and the planarization layer 207. Compared with a technical solution thatthere are two electrode layers between the first light-emitting unit 204and the planarization layer 107, an ITO electrode layer is removed inthe present disclosure, which is beneficial to simplifying themanufacturing process of the display panel 200 and saving cost.

Moreover, in this embodiment, there is only one electrode layer disposedbetween the first light-emitting unit 204 and the planarization layer207, which avoids bombardment of the ITO on the planarization layer 207and improves the interface performance of the planarization layer 207,and can further improve the quality and morphology of the firstelectrode layer 203 on the surface of the planarization layer 207, andcan improve the performance of the display panel 200.

In this embodiment, the display panel 200 further includes: a secondelectrode layer 222 and a second light-emitting unit 223 disposed in thetransition region 250. The second electrode layer 222 is disposed at aside, which is facing away from the driving backplane 201, of theplanarization layer 207 of the transition region 250 and the secondelectrode layer 222 is electrically connected with a second outputterminal (not labeled) by extending through the planarization layer 207.The second light-emitting unit 223 is disposed at a side, which isfacing away from the driving backplane 201, of the second electrodelayer 222. The second electrode layer 222 is used for providing anelectrical signal for the second light-emitting unit 223. The secondelectrode layer 222 is disposed at the same layer as the first electrodelayer 203. A material of the second electrode layer 222 is same as amaterial of the first electrode layer 203.

The planarization layer 207 of the transition region 250 is providedwith a second through hole. The second through hole exposes a part of asurface of the second output terminal. At least part of the secondelectrode layer 222 is also disposed in the second through hole. Thesecond output terminal of the second driving circuit is electricallyconnected with the second electrode layer 222 of the transition region250, and provides the electrical signal for the second light-emittingunit 223 of the transition region 250, so as to realize the imagedisplay function of the transition region 250.

Further, the second electrode layer 222 and the first electrode layer203 are disposed at the same layer, and a material of the secondelectrode layer 222 is same as a material of the first electrode layer203. Therefore, the second electrode layer 222 may be formed by the samepatterning process as the first electrode layer 203. That is, the secondelectrode layer 222 may be manufactured by the same process steps ofmanufacturing the first electrode layer 203, thereby simplifying theprocess steps and saving the manufacturing cost.

In this embodiment, the display panel 200 further includes: a thirdelectrode layer 208 and a third light-emitting unit 220 disposed in themain screen region 240. The third electrode layer 208 is disposed at aside, which is facing away from the driving backplane 201, of theplanarization layer 207 of the main screen region 240 and the thirdelectrode layer 208 is electrically connected with a third outputterminal 257 by extending through the planarization layer 207. The thirdlight-emitting unit 220 is disposed at a side, which is facing away fromthe driving backplane 201, of the third electrode layer 208. The thirdelectrode layer 208 is used for providing an electrical signal for thethird light-emitting unit 220. The third electrode layer 208 and thefirst electrode layer 203 are disposed at the same layer. A material ofthe third electrode layer 208 is same as a material of the firstelectrode layer 203.

The third output terminal 257 of the third driving circuit 217 iselectrically connected with the third electrode layer 208 of the mainscreen region 240 for providing the electrical signal to the thirdlight-emitting unit 220 of the main screen region 240, so as to realizethe image display function of the main screen region 240.

In one example, the planarization layer 207 disposed in the main screenregion 240 is provided with a third through hole 224 corresponding tothe first output terminal 257, and the third through hole 224 exposes apart of the surface of the first output terminal 257. At least a part ofthe third electrode layer 208 is disposed in the third through hole 224,and the third electrode layer 208 is electrically contact with the firstoutput terminal 257 to provide the electrical signal for the thirdlight-emitting unit 220.

Further, the third electrode layer 208 and the first electrode layer 203are disposed at the same layer, and a material of the third electrodelayer 208 is same as a material of the first electrode layer 203.Therefore, the third electrode layer 208 may be formed by the samepatterning process as the first electrode layer 203. That is, the thirdelectrode layer 208 may be manufactured by the same process steps ofmanufacturing the first electrode layer 203, thereby simplifying theprocess steps and saving the manufacturing cost.

In this embodiment, the display panel 200 further includes a fourthelectrode layer 205 covering the first light-emitting units 204, thesecond light-emitting unit 223 and the third light-emitting unit 220.The fourth electrode layer 205 is a cathode, and the material of thefourth electrode layer 205 is the same as the material of the firstelectrode layer 203.

The plurality of electrode blocks 241 disposed in the light-transmittingregion 260 and the fourth electrode layer 205 constitute a plurality ofmicrocavities. The second electrode layer 222 and the fourth electrodelayer 205 constitute microcavities. The third electrode layer 208 andthe fourth electrode layer 205 constitute microcavities. That is, thelight-transmitting region 260, the main screen region 240 and thetransition region 250 all have microcavities, so that thelight-transmitting region 260, the main screen region 240 and thetransition region 250 have relatively close chromaticity coordinates,thereby ensuring that the chromaticity coordinates of the whole displaypanel 200 tend to be consistent, improving the color uniformity of thedisplay panel 200 and further improving the display effect of thedisplay panel 200.

In this embodiment, the display panel 200 further includes: a pixeldefining layer 209 and a support post 221. The pixel defining layer 209is disposed on a side, which is facing away from the driving backplane201, of the planarization layer 207, and the pixel defining layer 209 isused for defining the positions of the first light-emitting unit 204,the second light-emitting unit and the third light-emitting unit. Thesupport post 221 is disposed on a side, which is facing away from thedriving backplane 201, of the pixel defining layer 209. The fourthelectrode layer 205 covers the support post 221.

In this embodiment, the main screen region 240, the transition region250 and the light-transmitting region 260 all have the image displayfunction. The light transmittance of the light-transmitting region 260is greater than the light transmittance of the main screen region 240and the light transmittance of the transition region 250. That is, thelight-transmitting region 260 may be used for both image display andlight transmission. Therefore, it is convenient to set the lightcollection component of the camera in the light-transmitting region 260,so that the light collection component of the camera can receive enoughlight while ensuring the high screen-to-body ratio, thereby improvingthe photographing effect of the camera.

In addition, there is no driving circuit in the driving backplane of thelight-transmitting region 260. The first driving circuit 216 of thetransition region 250 is electrically connected with the first electrodelayer 203 of the light-transmitting region 260 for providing theelectrical signals to the plurality of first light-emitting units 204electrically connected with the first electrode layer 203. Therefore,the light incident into the light-transmitting region 260 can beprevented from being reflected or blocked due to the driving circuit ofthe light-transmitting region 260. That is, the light transmittance ofthe light-transmitting region 260 can be improved, and the luminous fluxreceived by the light collection component of the camera disposed in thelight-transmitting region 260 can be improved, so that enough light canenter the light collection component of the camera, thereby improvingthe photographing effect and photographing quality of the camera.

In addition, there is only one electrode layer (i.e., the firstelectrode layer 203) disposed between the first light-emitting unit 204and the planarization layer 207. Compared with the technical solutionthat there are two electrode layers between the first light-emittingunit 204 and the planarization layer 207, one electrode layer is removedin the present disclosure, which is beneficial to simplifying themanufacturing process of the display panel 200 and saving cost.

That is to say, there is no need to provide a transparent conductivematerial such as ITO on the side of the planarization layer 207 facingthe driving backplane 201, so that the adverse effects caused by theprocess steps of forming the ITO can be avoided. The interfaceperformance of the planarization layer 207 can be improved, and thequality and morphology of the first electrode layer 207 can be improved.For example, the damage to the second output terminal of the transitionregion 250 and the third output terminal 257 of the main screen region240 caused by the process steps of forming the ITO can be avoided,thereby avoiding the abnormal overlapping problem and further improvingthe performance of the display panel 200.

Some embodiments of the present disclosure further provide a displaypanel. Different from the previous embodiments, in the display panelaccording to the embodiments, a first electrode layer disposed in alight-transmitting region is directly electrically connected with anelectrical connection portion of a transition region, so as to provideelectrical signals to a plurality of first light-emitting units. FIG. 4is a schematic diagram of a cross-sectional view of a display panelaccording to some embodiments of the present disclosure.

As shown in FIG. 4, the display panel 300 includes a transition region350, a light-transmitting region 360 and a main screen region 340 whichare adjacent to each other. The display panel 300 includes a drivingbackplane 301, a driving component layer 341, a planarization layer 307,a fourth electrode layer 305, a pixel defining layer 309, and a supportpost 321.

The driving component layer 341 provides a driving signal for alight-emitting unit in the display panel 300 to emit light. The drivingcomponent layer 341 is a multilayer film structure and includes: anactive layer 337, a gate dielectric layer 313, a gate electrode layer347, a first capacitor conductive layer 319, a capacitor dielectriclayer 314, a second capacitor conductive layer 318, and an insulatingdielectric layer 315.

The driving component layer 341 of the transition region 350 is providedwith a first driving circuit 316 and a second driving circuit (notshown). The first driving circuit 316 is provided with a first outputterminal 356. The second driving circuit is provided with a secondoutput terminal. The driving component layer 341 disposed in the mainscreen region 340 is provided with a third driving circuit 317, and thethird driving circuit 317 is provided with a third output terminal 357.

In this embodiment, the planarization layer 307 is provided with a firstthrough hole 325, a second through hole and a third through hole 324respectively corresponding to the first output terminal 356, the secondoutput terminal and the third output terminal 357. At least a part ofthe first electrode layer 303 is disposed in the first through hole 325and is electrically connected with the first output terminal 356 throughthe first through hole 325, and is used for providing the electricalsignals for a plurality of first light-emitting units 304 to realize animage display function of the light-transmitting region 360. At least apart of the third electrode layer 308 is disposed in the third throughhole 324 and is electrically connected with the third output terminal357 through the third through hole 324, and is used for providing theelectrical signals for a plurality of third light-emitting units 320 torealize an image display function of the main screen region 340.

Compared with the previous embodiments, the embodiments changes anarrangement of the driving component layer 341. That is, the firstoutput terminal 356 is closer to the light-transmitting region 360; andan electrical connection between the first electrode layer 303 and thefirst output terminal 356 may be realized without providing additionalelectrical connection portions and electrical connection layers. Thatis, the first electrode layer 303 is directly connected with the firstoutput terminal 356. Therefore, the manufacturing process of electricalconnection portions and other components of the transition region 350 issaved, which is beneficial to saving cost.

In addition, since the transition region 350 does not include componentssuch as the electrical connection portion, a size of the drivingbackplane 301 may be reduced, and an integration degree of the drivingbackplane 301 may be improved, thus reducing a size of the display panel300.

For the same or corresponding parts as the previous embodiment, pleaserefer to the previous embodiment in detail, which will not be repeatedin detail below.

Correspondingly, some embodiments of the present disclosure furtherprovide a display device, including the display panel in any of theforegoing embodiments. The display device may be a product or assemblywith a TV function such as a mobile phone, a tablet computer, a TV set,a display, a digital photo frame, or a navigator.

Further, the display device further includes a light collectioncomponent. The light collection component is disposed corresponding tothe position of the light-transmitting region, and the light collectioncomponent may be a camera or a fingerprint recognition chip or the like.

Some embodiments of the present disclosure further provide a method formanufacturing a display panel, which may be applied to theabove-mentioned display panel. The method for manufacturing the displaypanel according to some embodiments of the present disclosure will bedescribed in detail below with reference to the accompanying drawings.For the same or corresponding parts as the above embodiments, referencemay be made to the detailed description of the above embodiments, whichwill not be repeated here.

The method for manufacturing the display panel according to someembodiments of the present disclosure will be described in detail belowwith reference to FIGS. 5 to 9.

In step 51, as shown in FIG. 5, a driving backplane 401 is provided. Thedriving backplane 401 includes a main screen region 440, a transitionregion 450, and a light-transmitting region 460. The transition region450 is disposed between the main screen region 440 and thelight-transmitting region 460. The driving backplane 401 includes afirst driving circuit 416 disposed in the transition region 450, and thefirst driving circuit 416 is provided with a first output terminal 456.

The driving backplane 401 further includes a driving component layer441. In one example, the driving component layer 441 includes an activelayer 437, a gate dielectric layer 413, a gate electrode layer 447, afirst capacitor conductive layer 419, a capacitor dielectric layer 414,a second capacitor conductive layer 418 and an insulating dielectriclayer 415.

A second driving circuit (not labeled) is disposed in the transitionregion 450, and the second driving circuit is provided with a secondoutput terminal (not labeled). A third driving circuit 417 is disposedin the main screen region 440, and the third driving circuit 417 isprovided with a third output terminal 457.

The driving component layer 441 provides a driving signal for alight-emitting unit in the display panel to emit light. The drivingcomponent layer 441 is a multilayer film structure. In one example, thedriving component layer 441 of the transition region 450 is providedwith the first driving circuit 416 and a second driving circuit (notshown). The first driving circuit 416 is provided with the first outputterminal 456, and the second driving circuit is provided with a secondoutput terminal. The driving component layer 441 disposed in the mainscreen region 440 is provided with the third driving circuit 417, andthe third driving circuit 417 is provided with the third output terminal457.

In step S2, as shown in FIG. 6, an electrical connection portion 430 isformed on the driving backplane 401; and an electrical connection layer402 is formed on the driving backplane 401. The electrical connectionlayer 402 is used to realize an electrical connection between theelectrical connection portion 430 and the first output terminal 456.

A sputtering process is used to form an electrical connection film, andthen a part of the electrical connection film is removed by a wetetching to form a patterned electrical connection layer 402. An etchingsolution used in the wet etching is 5.0% oxalic acid aqueous solution.

A thickness of the electrical connection layer 402 is 280 Å to 340 Å,for example, 300 Å and 320 Å.

In step S3, as shown in FIG. 7, a planarization layer 407 is formed onthe driving backplane 401 disposed in the main screen region 440, thetransition region 450 and the light-transmitting region 460.

In the process steps of forming the planarization layer 407, a firstthrough hole 425 exposing the electrical connection portion 430 isformed. That is, the first through hole 425 is formed in the firstplanarization layer 407 of the transition region 450, and the firstthrough hole 425 exposes a part of a surface of the electricalconnection portion 430. A second through hole is formed in the firstplanarization layer 407 of the transition region 450, and the secondthrough hole exposes a part of a surface of the second output terminal.A third through hole 424 is formed in the first planarization layer 407of the main screen region 440, and the third through hole 424 exposes apart of a surface of the third output terminal 457.

In one example, a thickness of the planarization layer 407 may be 2.1μm.

In step S4, as shown in FIG. 8, a first electrode layer 403 is formed ona side, which is facing away from the driving backplane 401, of theplanarization layer 407, and the first electrode layer 403 iselectrically connected with the first output terminal 456 by extendingthrough the planarization layer 407. The first electrode layer 403disposed in the light-transmitting region 460 includes at least twoelectrode blocks and an electrode bridge connecting two adjacentelectrode blocks.

In one example, the first electrode layer 403 is disposed on the side,which is facing away from the driving backplane 401, of theplanarization layer 407 of the transition region 450 and thelight-transmitting region 460. The first electrode layer 403 is formedon a surface, which is facing away from the driving backplane 401, ofthe planarization layer 407 of the light-transmitting region 460, andthe first electrode layer 403 also covers a bottom and a side wall ofthe first through hole 425. Accordingly, the first electrode layer 403is electrically connected with the first output terminal 456 through theelectrical connection layer 402.

In this embodiment, the first electrode layer 403 includes a firsttransparent electrode layer, a metal electrode layer, and a secondtransparent electrode layer which are sequentially stacked. Herein, amaterial of the first transparent electrode layer is ITO, and athickness of the first transparent electrode layer is 80 Å˜120 Å, suchas 90 Å, 100 Å, and 110 Å. A material of the second transparentelectrode layer is ITO, and a thickness of the second transparentelectrode layer is 80 Å˜120 Å, such as 90 Å, 100 Å, 110 Å. A material ofthe metal electrode layer is Ag or Mg, and a thickness of the metalelectrode layer is 900 Åto 1100 Å, such as 950 Å, 1000 Å, or 1050 Å.

In this embodiment, in the process steps of forming the first electrodelayer 403, a second electrode layer 422 disposed on the planarizationlayer 407 of the transition region 450 and a third electrode layer 408disposed on the planarization layer 407 of the main screen region 440are also formed. In this way, the process steps and manufacturing costcan be saved.

In this embodiment, a wet etching process is used to form the firstelectrode layer 403, the second electrode layer 422 and the thirdelectrode layer 408. The etching liquid used in the wet etching processmay be acidic solution containing HNO₃, CH₃COOH and H₃PO₄.

In step S5, as shown in FIG. 9, a plurality of first light-emittingunits 404 disposed in the light-transmitting region 460 are formed, andthe first light-emitting unit 404 is correspondingly disposed at a side,which is facing away from the driving backplane 401, of each electrodeblock. The first electrode layer 403 is used for providing electricalsignals for the plurality of first light-emitting units 404.

A second light-emitting unit 423 disposed in the transition region 450is formed, and the second electrode layer 422 is used for providing anelectrical signal for the second light-emitting unit 423. A thirdlight-emitting unit 420 disposed in the main screen region 440 isformed, and the third electrode layer 408 is used for providing anelectrical signal for the third light-emitting unit 420.

Before forming the first light-emitting unit 404, the secondlight-emitting unit 423 and the third light-emitting unit 420, themethod further includes forming a pixel defining layer 409 on theplanarization layer 407.

The subsequent process steps further include: forming a supportingportion 421 on the pixel defining layer 409; and forming a cathode 405on the first light-emitting unit 404, the second light-emitting unit423, and the third light-emitting unit 420.

The method for manufacturing the display panel according to theembodiments uses the first electrode layer 403 to wiring for the anodeof the light-transmitting region 460, which saves an ITO manufacturingprocess and avoids adverse effects caused by the ITO manufacturingprocess on the planarization layer 407 of the transition region 450 andthe main screen region 440. Therefore, an Ag migration problem on theplanarization layer 407 of the transition region 450 and the main screenregion 440 may be avoided, thus avoiding a product abnormality problemcaused by the Ag migration.

In addition, in the embodiments, it may avoid the damage to the secondoutput terminal and the third output terminal 457 caused by the ITOprocess, thereby avoiding abnormal overlapping between the thirdelectrode layer 408 and the third output terminal 457 of the main screenregion 440, and avoiding abnormal overlapping between the secondelectrode layer 422 and the second output terminal of the transitionregion 450.

Moreover, the manufacturing method according to the embodiments isconducive to saving process steps, reducing manufacturing costs, andensuring the uniformity of the optical microcavity length of thelight-transmitting region 460, the transition region 450, and the mainscreen region 440, thereby improving the display effect of the displaypanel.

There is one electrode layer (i.e., the first electrode layer.) disposedbetween the first light-emitting unit and the planarization layer.Compared with the technical solution that there are two electrode layersbetween the first light-emitting unit and the planarization layer, thepresent embodiments removes one electrode layer, which is beneficial tosimplifying the manufacturing process of the display panel and savingthe cost. Furthermore, there is one electrode layer between the firstlight-emitting unit and the planarization layer in the presentdisclosure, which reduces the bombardment effect of a manufacturingprocess of the electrode layer on the surface of the planarizationlayer, improves the interface performance of the planarization layer,and further contributes to improving the quality and morphology of thefirst electrode layer and improving the performance of the displaypanel.

Those skilled in the art should appreciate that the aforementionedembodiments are specific embodiments for implementing the presentdisclosure. In practice, however, various changes may be made in theforms and details of the specific embodiments without departing from thespirit and scope of the present disclosure.

What is claimed is:
 1. A display panel, comprising a transition regionand a light-transmitting adjacent to the transition region, a lighttransmittance of the light-transmitting region being greater than alight transmittance of the transition region, wherein the display panelcomprises: a driving backplane comprising a first driving circuitdisposed in the transition region, the first driving circuit beingprovided with a first output terminal; a planarization layer disposed onthe driving backplane of the transition region and thelight-transmitting region; a first electrode layer disposed at a side,facing away from the driving backplane, of the planarization layer ofthe transition region and the light-transmitting region, wherein thefirst electrode layer is electrically connected with the first outputterminal by extending through the planarization layer; wherein the firstelectrode layer disposed in the light-transmitting region comprises atleast two electrode blocks and an electrode bridge connecting twoadjacent electrode blocks; and a plurality of first light-emitting unitsdisposed in the light-transmitting region, wherein each of the pluralityof first light-emitting units is correspondingly disposed at a side,facing away from the driving backplane, of corresponding one of the atleast two electrode blocks; the first electrode layer is configured toprovide electrical signals for the plurality of first light-emittingunits.
 2. The display panel according to claim 1, wherein across-sectional width of the electrode bridge ranges from 1 μm to 4 μmin a direction orthogonal to a surface of the driving backplane andperpendicular to an extending direction of the electrode bridge.
 3. Thedisplay panel according to claim 1, wherein an orthographic projectionof the electrode bridge on the driving backplane is at least located ina region between two orthographic projections of two adjacent firstlight-emitting units on the driving backplane.
 4. The display panelaccording to claim 1, wherein an orthographic projection of the firstlight-emitting unit on the driving backplane is larger than anorthographic projection of the electrode block corresponding to thefirst light-emitting unit on the driving backplane.
 5. The display panelaccording to claim 1, wherein an area of an orthographic projection ofthe electrode bridge on the driving backplane is smaller than an area ofan orthographic projection of the electrode block on the drivingbackplane.
 6. The display panel according to claim 1, wherein the firstelectrode layer in the light-transmitting region has a zigzag shape, andeach of the electrode blocks is positioned at an inflection point of thezigzag shape.
 7. The display panel according to claim 6, wherein twoadjacent electrode bridges of the first electrode layer are parallel,and a distance between the two adjacent electrode bridges which areparallel is greater than or equal to 5 μm.
 8. The display panelaccording to claim 6, wherein the plurality of first light-emittingunits are distributed in a zigzag shape.
 9. The display panel accordingto claim 1, wherein the first electrode layer comprises a firsttransparent electrode layer, a metal electrode layer and a secondtransparent electrode layer which are sequentially stacked.
 10. Thedisplay panel according to claim 1, wherein the display panel furthercomprises: an electrical connection portion disposed at a side, facingto the driving backplane, of the planarization layer of the transitionregion, wherein the first electrode layer is in contact with theelectrical connection portion by extending through the planarizationlayer; and an electrical connection layer disposed at the side, facingto the driving backplane, of the planarization layer of the transitionregion, wherein the electrical connection layer is configured toelectrically connect the electrical connection portion with the firstoutput terminal.
 11. The display panel according to claim 10, wherein alight transmittance of the electrical connection layer is greater than alight transmittance of the first electrode layer.
 12. The display panelaccording to claim 1, wherein the driving backplane comprises a thirddriving circuit disposed in the transition region, the third drivingcircuit comprises a third output terminal, the display panel furthercomprises: a second electrode layer disposed at a side, facing away fromthe driving backplane, of the planarization layer of the transitionregion, and the second electrode layer being electrically connected withthe second output terminal by extending through the planarization layer;and a second light-emitting unit disposed in the transition region,wherein the second light-emitting unit is disposed at a side of thesecond electrode layer facing away from the driving backplane, whereinthe second electrode layer is configured to provide an electrical signalfor the second light-emitting unit.
 13. The display panel according toclaim 12, wherein a material of the second electrode layer is same as amaterial of the first electrode layer.
 14. The display panel accordingto claim 12, wherein the second electrode layer and the first electrodelayer are arranged at a same layer.
 15. The display panel according toclaim 1, wherein the display panel further comprises a main screenregion, the transition region is disposed between the main screen regionand the light-transmitting region; the driving backplane furthercomprises a third driving circuit disposed in the main screen region,and the third driving circuit is provided with a third output terminal;and the display panel further comprises: a third electrode layerdisposed at a side, facing away from the driving backplane, of theplanarization layer of the main screen region, wherein the thirdelectrode layer is electrically connected with the third output terminalby extending through the planarization layer; and a third light-emittingunit disposed in the main screen region, wherein the thirdlight-emitting unit is disposed at a side of the third electrode layerfacing away from the driving backplane, and the third electrode layer isconfigured to provide an electrical signal for the third light-emittingunit.
 16. The display panel according to claim 15, wherein a material ofthe third electrode layer is same as a material of the first electrodelayer.
 17. The display panel according to claim 15, wherein the thirdelectrode layer and the first electrode layer are arranged at a samelayer.
 18. A display device, comprising the display panel according toclaim 1.